These are all based on Classical roots, including انثبر, whose root ثبر means to imprison or keep in check. I don't think انثبر (which typically means "stay put" rather than "sit down") is known, however, outside of Saudi Arabia and the Gulf.

There's انقلع, meaning "get lost", which is understood in most eastern dialects (including Syria, etc.). There's انجبّ (the ج is a 'ch' here rather than a 'j'), used on the Gulf coast, which means "shut up" and is probably a loan word.

There's انجبّ (the ج is a 'ch' here rather than a 'j'), used on the Gulf coast, which means "shut up" and is probably a loan word.

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This word is possibly coming from the Persian word (چَپ Chap) which literally means (left). And it can also mean (to divert/deviate from/stray/get lost...etc.) when it is attached with (شُدن=to be) i.e. چپ شدن

So it can mean "shut up and get lost" (after changing its meaning a bit or misusing it by us "Arabs"), and it might have gradually become in the sense of only "shut up".

This word is not used among the Persians themselves to insult or scold someone, but this does not mean that my assumption is incorrect since there are many similar words which have come from Persian into our colloquial Arabic with a little change in meaning or usage, and the opposite is also true (for Arabic words in Persian slang).